rule win_trochilus_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.trochilus_rat."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.trochilus_rat"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 8d7b18 8d7008 33d2 f3a6 7405 1bd2 83daff }
            // n = 7, score = 100
            //   8d7b18               | lea                 edi, [ebx + 0x18]
            //   8d7008               | lea                 esi, [eax + 8]
            //   33d2                 | xor                 edx, edx
            //   f3a6                 | repe cmpsb          byte ptr [esi], byte ptr es:[edi]
            //   7405                 | je                  7
            //   1bd2                 | sbb                 edx, edx
            //   83daff               | sbb                 edx, -1

        $sequence_1 = { 56 57 8d4d8c e8???????? 56 57 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d4d8c               | lea                 ecx, [ebp - 0x74]
            //   e8????????           |                     
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_2 = { 99 59 f7f9 8d7001 83fe64 7e03 6a64 }
            // n = 7, score = 100
            //   99                   | cdq                 
            //   59                   | pop                 ecx
            //   f7f9                 | idiv                ecx
            //   8d7001               | lea                 esi, [eax + 1]
            //   83fe64               | cmp                 esi, 0x64
            //   7e03                 | jle                 5
            //   6a64                 | push                0x64

        $sequence_3 = { 6823540010 6a00 6a00 ff15???????? 894608 }
            // n = 5, score = 100
            //   6823540010           | push                0x10005423
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   894608               | mov                 dword ptr [esi + 8], eax

        $sequence_4 = { 397e16 0f8484000000 6a04 8d45f0 50 8bcb 897d08 }
            // n = 7, score = 100
            //   397e16               | cmp                 dword ptr [esi + 0x16], edi
            //   0f8484000000         | je                  0x8a
            //   6a04                 | push                4
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   8bcb                 | mov                 ecx, ebx
            //   897d08               | mov                 dword ptr [ebp + 8], edi

        $sequence_5 = { e8???????? 83c41c 33c0 e9???????? 6a01 6a02 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   6a01                 | push                1
            //   6a02                 | push                2

        $sequence_6 = { 68???????? 50 ff15???????? 85c0 7404 33c0 eb1a }
            // n = 7, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7404                 | je                  6
            //   33c0                 | xor                 eax, eax
            //   eb1a                 | jmp                 0x1c

        $sequence_7 = { ff5040 6a00 ff7508 8bfe 8bd8 e8???????? 85db }
            // n = 7, score = 100
            //   ff5040               | call                dword ptr [eax + 0x40]
            //   6a00                 | push                0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8bfe                 | mov                 edi, esi
            //   8bd8                 | mov                 ebx, eax
            //   e8????????           |                     
            //   85db                 | test                ebx, ebx

        $sequence_8 = { c20400 80790400 7403 6a06 58 c3 55 }
            // n = 7, score = 100
            //   c20400               | ret                 4
            //   80790400             | cmp                 byte ptr [ecx + 4], 0
            //   7403                 | je                  5
            //   6a06                 | push                6
            //   58                   | pop                 eax
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_9 = { bf06020000 57 668985ecfbffff 8d85eefbffff 53 50 c785e0fbffff03000000 }
            // n = 7, score = 100
            //   bf06020000           | mov                 edi, 0x206
            //   57                   | push                edi
            //   668985ecfbffff       | mov                 word ptr [ebp - 0x414], ax
            //   8d85eefbffff         | lea                 eax, [ebp - 0x412]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   c785e0fbffff03000000     | mov    dword ptr [ebp - 0x420], 3

    condition:
        7 of them and filesize < 630784
}